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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkDerivativeOperator.txx,v $
Language: C++
Date: $Date: 2008-01-20 18:00:40 $
Version: $Revision: 1.22 $
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef _itkDerivativeOperator_txx
#define _itkDerivativeOperator_txx
#include "itkDerivativeOperator.h"
#include "itkNumericTraits.h"
namespace itk
{
template <class TPixel, unsigned int VDimension, class TAllocator>
typename DerivativeOperator<TPixel, VDimension, TAllocator>
::CoefficientVector
DerivativeOperator<TPixel, VDimension, TAllocator>
::GenerateCoefficients()
{
unsigned int i;
unsigned int j;
PixelRealType previous;
PixelRealType next;
const unsigned int w = 2*((m_Order + 1)/2) + 1;
CoefficientVector coeff(w);
coeff[w/2] = 1.0;
for (i = 0; i < m_Order/2; i++)
{
previous = coeff[1] - 2 * coeff[0];
for (j = 1; j < w - 1; j++)
{
next =coeff[j - 1] + coeff[j + 1] - 2*coeff[j];
coeff[j-1] = previous;
previous = next;
}
next = coeff[j - 1] - 2*coeff[j];
coeff[j-1] = previous;
coeff[j] = next;
}
for (i = 0; i < m_Order%2; i++)
{
previous = 0.5 * coeff[1];
for (j = 1; j < w - 1; j++)
{
next = -0.5*coeff[j - 1] + 0.5*coeff[j + 1];
coeff[j-1] = previous;
previous = next;
}
next = -0.5 * coeff[j - 1];
coeff[j-1] = previous;
coeff[j] = next;
}
return coeff;
}
} // namespace itk
#endif
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